This message is to notify you that your Xbox Live account has been subject to enforcement...

They should've notified you by e-mail that's associated with your Xbox Live account and a messaged over Xbox Live. From the Enforcement website:

How am I notified of my suspension?

When XBLPET issues an enforcement action, an email message is automatically sent to the address associated with your Xbox Live account. This address is referred to as your Microsoft Account (MSA). If you are using a child account, an
email is also sent to the Microsoft Account associated with your parent or guardian. Each email message explains that the account was subject to enforcement action and links to pages that provide additional information.

In addition to the email message, affected accounts also receive an Xbox Live message that can be viewed from your Xbox console, Xbox.com, and the Xbox app on Windows 10. Like the email, this message explains that the account received
enforcement action and provides links to more information. Note that if you have received a full account suspension you may be unable to view this message, and will instead be notified upon attempting to sign in to Xbox Live that the account has been suspended
from the service.

Feature-specific notifications are also displayed when attempting to use impacted features or apps on your Xbox One console. The specific method of notification depends on the enforcement type and what feature or app you select, but
typically include a notification indicating you are not allowed to use the feature.

https://enforcement.xbox.com/home/howto#sub-topic0-4

So i think i got it. I reported someone for telling me he was going to boot me offline when playing nba live 19 the other day over a message. I was playing xbox then got off. Xbox live sent me a message saying he was banned but sense then i have
not been able to play xbox. Do you think they banned me or are the servers just bad?

If you received a suspension, then they would notify you.

How am I notified of my suspension?

When XBLPET issues an enforcement action, an email message is automatically sent to the address

associated with your Xbox Live account. This address is referred to as your Microsoft Account (MSA). If you are using a child account, an email is also sent to the Microsoft Account associated with your parent or guardian. Each email
message explains that the account was subject to enforcement action and links to pages that provide additional information.

In addition to the email message, affected accounts also receive an Xbox Live message that can be viewed from your Xbox console, Xbox.com, and the Xbox app on Windows 10. Like the email, this message explains that the account received
enforcement action and provides links to more information. Note that if you have received a full account suspension you may be unable to view this message, and will instead be notified upon attempting to sign in to Xbox Live that the account has been suspended
from the service.

https://enforcement.xbox.com/home/howto#sub-topic0-4

How am I notified of my suspension?

When XBLPET issues an enforcement action, an email message is automatically sent to the address associated with your Xbox Live account. This address is referred to as your Microsoft Account (MSA). If you are using a child account, an
email is also sent to the Microsoft Account associated with your parent or guardian. Each email message explains that the account was subject to enforcement action and links to pages that provide additional information.

In addition to the email message, affected accounts also receive an Xbox Live message that can be viewed from your Xbox console, Xbox.com, and the Xbox app on Windows 10. Like the email, this message explains that the account received
enforcement action and provides links to more information. Note that if you have received a full account suspension you may be unable to view this message, and will instead be notified upon attempting to sign in to Xbox Live that the account has been suspended
from the service.

Feature-specific notifications are also displayed when attempting to use impacted features or apps on your Xbox One console. The specific method of notification depends on the enforcement type and what feature or app you select, but
typically include a notification indicating you are not allowed to use the feature.

https://enforcement.xbox.com/home/howto#sub-topic0-4

How am I notified of my suspension?

When XBLPET issues an enforcement action, an email message is automatically sent to the address associated with your Xbox Live account. This address is referred to as your Microsoft Account (MSA). If you are using a child account, an email is also sent to
the Microsoft Account associated with your parent or guardian. Each email message explains that the account was subject to enforcement action and links to pages that provide additional information.

In addition to the email message, affected accounts also receive an Xbox Live message that can be viewed from your Xbox console, Xbox.com, and the Xbox app on Windows 10. Like the email, this message explains that the account received enforcement action
and provides links to more information. Note that if you have received a full account suspension you may be unable to view this message, and will instead be notified upon attempting to sign in to Xbox Live that the account has been suspended from the service.

Feature-specific notifications are also displayed when attempting to use impacted features or apps on your Xbox One console. The specific method of notification depends on the enforcement type and what feature or app you select, but typically include a notification
indicating you are not allowed to use the feature.

https://enforcement.xbox.com/en-US/home/howto#sub-topic0-4

How am I notified of my suspension?

When XBLPET issues an enforcement action, an email message is automatically sent to the address associated with your Xbox Live account. This address is referred to as your Microsoft Account (MSA). If you are using a child account, an email is also sent to
the Microsoft Account associated with your parent or guardian. Each email message explains that the account was subject to enforcement action and links to pages that provide additional information.

In addition to the email message, affected accounts also receive an Xbox Live message that can be viewed from your Xbox console, Xbox.com, and the Xbox app on Windows 10. Like the email, this message explains that the account received enforcement action
and provides links to more information. Note that if you have received a full account suspension you may be unable to view this message, and will instead be notified upon attempting to sign in to Xbox Live that the account has been suspended from the service.

Feature-specific notifications are also displayed when attempting to use impacted features or apps on your Xbox One console. The specific method of notification depends on the enforcement type and what feature or app you select, but typically include a notification
indicating you are not allowed to use the feature.

https://enforcement.xbox.com/en-us/home/howTo#sub-topic0-4