Hi David, welcome to the Community!
Have you followed the recommendation that you got at the bottom of the error message?:
Updates were rejected because a pushed branch tip is behind its remote counterpart. Check out this branch and integrate the remote changes (e.g. 'git pull ...') before pushing again. See the 'Note about fast-forwards' in 'git push --help' for details.
Can you try that and let us know if it worked for you?
If you're still having issues, and for troubleshooting purposes, can you let us know if pushing from the command line gives you any error?
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