I'm embarrased to say how many hours I have now spent trying to fix this.
In my efforts to make things look pretty, I deleted the {task:title} hyperlink in the assign a task action. I then went to recreate it with something a little better but there seems to be absolutely no way to recreate this link.
One would think that you could just select task title in the advanced lookup <<BUZZ>> try again
Selecting the URL from advanced lookup is correct but I have yet to find the secret sauce to make it linkable.
Oh how I miss on prem...
Anyone else run into this issue and have a solution? I'm running a new test now, I'll see if it works. So slow to save and test the workflow over and over..