Client has Teams Phones that will not authenticate

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Please i need your help on this issue.

Our Teams Client has Yealink T55A Teams phones that will not enroll via device administrator through InTune.

The devices appear to register and enroll, but are immediately marked as non-compliant and set to "retire pending".

Struggling to see why this is happening, the only compliance policy simply checks for rooted devices. Would appreciate some help troubleshooting this.

Microsoft Teams
Microsoft Teams
A Microsoft customizable chat-based workspace.
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Microsoft Intune Configuration
Microsoft Intune Configuration
Microsoft Intune: A Microsoft cloud-based management solution that offers mobile device management, mobile application management, and PC management capabilities.Configuration: The process of arranging or setting up computer systems, hardware, or software.
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