The all-in-one script should provide the user's credentials earlier in the process.

The code here:
https://github.com/open-horizon/devops/blob/master/mgmt-hub/deploy-mgmt-hub.sh#L1351
never runs if even a simple and correctable error occurs. As a result, the user's credentials for the hub are essentially discarded (they are never given access to them). The user must then always start over from scratch in this situation instead of just fixing the error and continuing. Some examples of correctable errors are something going wrong during example publication or during node registration (both of which happen after after successful Management Hub setup). Both of these examples happened to me while trying to get the all-in-one running under WSL2 on Windows.
I think ideally the Management Hub's user credentials should written into a file whose filename was announced early in the script and then again near the end. For maximum user convenience the credentials would be written in a form that could simply be sourced into a shell.

Start at mgmt-hub/deploy-mgmt-hub.sh around line 1351 and trace when Management Hub setup succeeds versus when example publication or node registration fails. Define the credential file location and shell-sourceable format from the issue, then verify that its filename is announced early and again near the end and that credentials remain available after a correctable failure.