Hi Eric,
I apologize for the delay in getting back to you.
I also really appreciate you reaching out to me directly.
Here is the error that I kept getting. They were all the same.
Overview: Formula ProcessSyncSets failed: Connection or proxy 6fd3616a-3da3-476c-8b3c-c41326b897de not valid for formula type action
User ID
470145
Pack Version
104
Pack ID
10448
Request ID
9dc71908-1ed0-491b-8b69-c974d1843bbe
Created at
May 29, 2022 @ 00:33:20
Request type
invokeFormulaRequest
Duration
237ms
Error
Connection or proxy 6fd3616a-3da3-476c-8b3c-c41326b897de not valid for formula type action
I was dorking around with Authentication stuff. I had started with System Authentication and got that to work. I then changed that to User Authentication to see if I could get that to work. I started experiencing the issue at that point so I thought it was something I had done. The final go at that is V102 attached. I reverted the code to an earlier version that used System Authentication (V104 attached) thinking that would sort it out. Unfortunately it did not.
I tried a different pack that I’ve been using in production and added it to a document. I got the same error.
At this point I assumed something must be up at the server. The Status page showed all green and I decided that this was new and would likely resolve itself eventually.
I don’t think I mentioned in the post that I also couldn’t get access to the pack marketplace either during this. This is what ultimately convinced me it was not just my code. 
I tried again the next day and everything was working as expected. I haven’t gone back to the User Authentication code yet. I haven’t had that issue since.
I hope this helps.
If there’s anything else, please let me know.
Have a terrific day!
Thanks again,
Robin
(Attachment Data Sync - V104.ts is missing)
(Attachment Data Sync - V102.ts is missing)