Additional features, settings, or issues not covered by specific Microsoft Teams categories
Seeing the comments now. If my recommendations don't work, then all you can do is reach out to Microsoft support. Don't think there is anything you can do to fix this yourself, unfortunately. Make sure to share links to this thread and/or the one in the TechCommunity forum and explain what you already have tried. What I understand is that this feature relies on the connected SharePoint site and I was able to fix it every time by simply navigating to the site or uploading files which both provision the site if it's not provisioned already.