[IA] Got locked out of literally every work system with no explanation. Am I getting fired

I’m an at-will intern at a large GC and this happened Friday morning.
Out of nowhere my company Microsoft account got blocked. Couldn’t get into Outlook, couldn’t log into my laptop, then realized I was also logged out of Procore and Autodesk Construction Cloud. Basically all of my work access disappeared at once.
What’s confusing is nobody on my actual project team seemed to know anything.
I called one of the PEs I work with and he said he had no idea why it happened and started trying to get me an IT number. The safety guy was literally asking me to pick up biscuits for the team that morning, so everyone on site was acting like it was a normal workday and like I was still supposed to be there.
I texted HR and haven’t gotten a response, but it’s also Labor Day weekend now.
I’m an intern and my internship has been extended past its original timeline, so part of me is wondering if some HR end date expired and automatically shut everything off.
The other part of me is thinking this looks exactly like offboarding and I got fired before anyone bothered to tell me.
Nobody has asked for my laptop or badge, nobody told me to leave, and nobody has actually told me my employment ended. But being locked out of Microsoft + laptop + Procore + ACC all at once has me pretty worried.
Has anyone had this happen before? Did it turn out to be an HR/IT mistake, or were you actually being terminated?