If the gMSAs can't replicate to other DCs, you may try to run the following command and check if there are any errors in the output.
Repadmin /syncall /APeD
Repadmin /showrepl *
repadmin /showrepl /all >c:\repadmin.txt
Dcdiag /v >c:\dcdiag.log
I am checking to see if the problem has been resolved.
If there's anything you'd like to know, don't hesitate to ask.
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