so i have 2 number linked to my Microsoft account, but i only have access to the new one,...

Thank you riverMC.
You can try to gain access again to it by following each method provided in this related article:

https://answers.microsoft.com/en-us/outlook_com...

The last resource you have is to use the key that the system generated when you enabled two steps verification.

Hello RiverMC
So, it seems you enabled two-factor authentication in your account. Is that correct?

you know when it lets you verify with your number or an app? it only shows my old number, thus making me not being able to verify with my new number

Hello Rivermc, this is Manuela. I'm an Independent Advisor and community user like you, ready to assist with this.
Not a Microsoft employee.

I'm sorry to hear you're not able to verify your identity for your Microsoft account. May I know if you're able to see an option that says "I can't use this phone number"?

As a reminder, please don't share personal information including your email or phone number

Hi I kinda have the same problem. On my PS5 I have a old Microsoft account linked to my Minecraft and no longer have access to the old Microsoft account and just need it unlinked so I can put my new Microsoft account on it so I can play cross platform

Once a Microsoft account is linked to a Playstation account, Sony does not allow you to link to any other accounts. You can only ever link to the original account. These are Sony's policies. You would have to contact them to get them to change their policy.