Thanks for keeping us updated @aparm23
Was this a private upgradeable contract or a public upgradeable contract?
Have you tried deploying and interacting the same contract as a standard public contract (not a ZeppelinOS upgradeable contract). (Apologies if I haven’t got the terminology right).
What version of ZeppelinOS and Truffle are you using?
(Regards Truffle, was thinking of this issue: Upgrade truffle 5.0.13+ to 5.0.20)