FortiAP SN in Certificate differs to actual Serial Number of device

[arna]

We have an issue with a FortiAP U421E. It fails to connect to the fortigate because of a SN missmatch.

ap-sn-mismatch

JOIN REQ from WTP is denied due to SN mismatch

AP's SN in cert is PU421E3X16xxxxxx, while SN in JOIN-REQ is PU421E3X16yyyyyy.

Same behaviour on factory defaults with initial firmware.

Has anyone suggestions how to solve the problem?

[adambomb1219]

What firmware? Upgrade it to the latest and try again.

Also 421e is EOL since 2023.

[arna]

Thank you. I am aware that the AP is EOL. Its for my homelab. Firmware makes no difference. Its the same issue from factory defaults to latest availabe on 7.0.5. Version.

[adambomb1219]

What version is the FortiGate running? Also where did you purchase this AP?