Hi,
Thank you for your posting!
Based on your descriptions, please check if it is running as the account you are testing to access the shared folder - sometimes it is running as an account which may not have permission on target folder. Or you can check if it has some sharing permissions incorrectly set on your destination folder.
I found this blog's issue is similar with yours (although its environment is server 2012, it should be applied to your 2019 server as well):
In addition, I suggest you not to post the location of your shared folder for security reason, you can use screenshots and black your location with pen.
Thank you for your time!
Best regards
Joan
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