Currently, if a repository name from Bitbucket Server contains a space and hyphen (e.g. "Test - repo"), the BCMA pre-flight checks will show the warning message below:

Some of your repositories are formatted incorrectly. You will need to fix the errors listed below to successfully migrate your repositories to the cloud. Learn more

Right now the solution is to rename the Bitbucket Server repository without the space and hyphen.

Enhancement request:
It would be beneficial for customers if we could allow migrating repositories regardless of names.