Lost access to ABM

XVsorim Said:

"He is using Windows. He don't need Apple device, because he is managing only Intune MDM. The problem is that the client can't add more devices to ABM and enroll to Intune in supervised mode due to loss of access to ABM"

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Apple Business Manager Glitches:

Seems to be a glitch. From here, ask this in the Developer forums. You're likely to get the answer you need in there: Apple Business Manager | Apple Developer Forums

XVsorim Said:

"Lost access to ABM: [...]The problem was that these accounts were accessed by one person who used Cyber Ark to save credentials. After saving the credentials for the administrator accounts, an error occurred with Cyber Ark and the passwords of these accounts were saved incorrectly.[...]"

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Keychain:

Have the person use Keychain for logins, and then enable keychain in iCloud settings on their devices. Elsewise, it Keychain already enabled, and the credentials changed in iCloud.

They will need to call Apple Support for enterprise to start the recovery process. Note that this process can be lengthy. I went through it a couple of times when joining an org that didn't know the login crews. It took 3-4 weeks each time.

XVsorim Said:

"Lost access to ABM: Unfortunately, the person does not use iCloud and Apple devices :/"

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Then, what device do they use? These are Apple forums.