A similar problem was evident in PVE 8.1.3. I thought there was a problem with the API and wrote to support Zilore.
RE:
It looks like you're using an external plugin, which we unfortunately don't support.
For the test. If I delete a value from the API Data field, I see an error:
Loading ACME account details
Placing ACME order
Order URL: https://acme-staging-v02.api.letsencrypt.org/acme/order/*******/*********
Getting authorization details from...
Hi! PMG 8.0.7 (all updates). API key Zilore correct 100%.
I try order certificate, but error:
Loading ACME account details
Placing ACME order
Order URL: https://acme-staging-v02.api.letsencrypt.org/acme/order/******484/******52484
Getting authorization details from...