Cannot access insider hub, update issue

Not to sure why they would send you back to general forum support, because Xbox Forum support can't access any information regarding your status in the Xbox Insider program. I would suggest you chat with a Xbox Preview support member using the "Chat with
support People in line: x" feature on the forum I listed above. That will get you directly to a Xbox Preview team member who should be able to get the exact answer to why you can't join, or at least pass your account along to someone who manages registration
that can.

Hi,

Regarding anything with the Xbox Insider program, you'll need to post in the Xbox Preview forums here: https://forums.xbox.com/en-US/forums/6937b0de-f1dc-422c-a331-bdd036790d88_2ddd9da3-b358-46cb-896e-76...

Once you post there, a preview team member can take a look at your status in the Xbox Insider program. You should still be able to participate in the program as long as there hasn't been any enforcement action taken against you within the past year. In the
meantime, can you please try removing your account from the console (Settings>Account) and then clearing the consoles cache ( hold down the power button for 8-10sec. till the system shuts down). After that, please re-downlaod your account and try to access
the Xbox Insider hub again.

Thanks for the reply but I already post in the forum you suggest two days ago and they tell me to write here to find help..

Hi,

Regarding anything with the Xbox Insider program, you'll need to post in the Xbox Preview forums here: https://forums.xbox.com/en-US/forums/6937b0de-f1dc-422c-a331-bdd036790d88_2ddd9da3-b358-46cb-896e-76...

Once you post there, a preview team member can take a look at your status in the Xbox Insider program. You should still be able to participate in the program as long as there hasn't been any enforcement action taken against you within the past year. In the
meantime, can you please try removing your account from the console (Settings>Account) and then clearing the consoles cache ( hold down the power button for 8-10sec. till the system shuts down). After that, please re-downlaod your account and try to access
the Xbox Insider hub again.

Hi,

Could be also the fact that there is no more testing slot available for you.

I suggest you to go also checking the official insider reddit webpage to know more about that program > https://www.reddit.com/r/xboxinsiders/

Regards

It could be an issue at Microsoft's end. What I would do is report the issue using the insider app. You should be able to report the issue using the app.