Hi ,
Is there something in 2019 that is disabled by default/or enabled that it won't allow the administrator account to access certain shares?
No, as far as I know, there is no such limitation.
Please try to create a new share on Linux and give it correct permission. Then check again if you can access the share with domain\administator account.
If you still cannot access the share with domain\administator account, please check SMB client log on server 2019 to see if there are something related for us to troubleshooting.
Best Regards,
Candy
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