Unable to connect to Planner through Teams

Hey All,

I know this has been brought up before, but the previous thread about this doesn't look like it was ever resolved.

I am having a problem connecting to Planner through Teams. This issue has been intermittent for the better part of six months, but in the last 3-4 weeks, it's become chronic to the point where Planner will not load for ANY version of Teams; desktop app, web app or mobile app.

The error is the same unhelpful 'there was a problem connecting to this app'.

The above screenie is when trying to add a tab to a team, but the result is the same no matter how I try to connect through Teams.

I have tried several troubleshooting measures, suggest from the older thread to no avail. I have added all the Microsoft trusted sites to both my windows Internet settings and added them as exceptions to my anti-virus.

I have tried completely disabling my anti-virus for a few minutes to test.

I have rebooted my machine and router multiple times.

I have made sure that all installs of Office apps are using the correct bit version (64 bit in my case).

I have uninstalled and reinstalled Teams on its own. I have uninstalled and reinstalled the entire Office suite of apps.

Device Info:

Windows Info:

At this point, I'm out of ideas as to what to try, and any help would be greatly appreciated.

Thank you everyone!

Todd