
I installed volume licensed version of Office LTSC Professional Plus 2021 via ODT, its version is Version 2108 (Build 14332.20145), and I could not reproduce your issue.
There may be some reasons for the error message you said, such as 3rd-party COM add-ins, the Additional Settings under Formats settings under Region and etc. It needs troubleshootings in a problematic use environment.
Thanks for your understanding.
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