I'm currently setting up iOS BYOD user enrollment through Intune and Apple Business Manager. I've set up our domain inside ABM and it has been verified. I have also created users within ABM which match their Microsoft 365 account name.
For my test user, everything worked great. It prompts with the question "Who owns this device?" and I am able to select the option to secure work-related apps and data only. Then it can download the profile and install properly after entering in my managed apple ID info. However when I test this with my account or my bosses account, we get the following error setting up the profile after entering the Apple ID info. Any ideas?