[Both times] when you signed up for a forum account, you agreed to the Community Guidelines which say, in part

Keep it Relevant and Appropriate

...Please refrain from discussing personal matters or, in general, from posting content in a manner unrelated to the resolution of issues regarding AT&T products and services. Other inappropriate or unacceptable behavior includes: ... d) discussing participant bans or other Moderator actions.

As such, even someone who knows cannot discuss the reason.

@JefferMC  I understand that but two days ago i was able to log in and this morning it says that account is blocked. How can I find out why? How do I know it's not by mistake? Is there anyone to talk to?

I will say that I don't see posts currently still attached to your other user that would say "yep, that's why he's gone."  It could have been something you posted that triggered the platform's automated spam filter which deleted the "spam" post and blocked you, and I'm doubtful that even the moderation staff can necessarily tell any details of when that sort of thing happened.

There's no way for you to directly contact the community staff (at least, not one that I know of).  All you can do is hope one of them sees your post and sends you a DM or something.

@JefferMC Lets hope so. Thank you for responding

I wonder if it’s the profile pic you had (and have) chosen as it could be perceived as controversial and potentially problematic.  Years ago I changed my tag line to something that was open to interpretation and was asked to remove it.

From the Guidelines:

Moderators may take any action including editing or deleting material (posts, photos, attachments, profile data, avatars and private messages) as well as banning individual users whose behavior detracts from the experience of other users or the purpose of the Community Forums.

There may have been complaints.  It is unfortunate that you were not advised of such.  🤷‍♂️

@skeeterintexas So picture of President Trump bother people? I thought we live in the country with freedom of expression. I guess we have people with TDS.

Try another avatar and see what happens. It only takes one member to find that pic offensive and make a complaint.

🤷‍♂️

@skeeterintexasSo picture of President Trump bother people? I thought we live in the country with freedom of expression. I guess we have people with TDS.

You do have freedom of expression in this country, just not on a privately owned forum who have rules against such. Don't like the rules, don't join the forum. You had to accept the rules when you joined. 

@spoom2 So which rule did I brake by using President Trump's picture as my avatar pic?