Yubikey usage issues when registered with multiple protocols

Yubikey usage issues when registered with multiple protocols

I am able to register the same Yubikey 5 with different protocols like HOTP and U2F

but after first try to use it, it does not respond to any

  • brand new Yubikew
  • Yubikey 5 registered as HOTP
    • login test : OK
    • delete the registred Yubikey
  • Yubikey 5 registered as U2F
    • login test: OK
  • Yubikey 5 registered as U2F and HOTP
    • register the Yubikey as HOTP
    • the same Yubikey is now registered as U2F and HOTP
    • it coud be assigned to the same user or another one. No difference in the rest of the test
    • login test: KO

is it a bug or a misconfigured settings somewhere?
Thanks for your kind assistance