Hi Alex,
Host server HBA wwn id should ideally get auto detected in MSA if zoning is configured properly and there is nothing much that could be configured at MSA end.
Please try the following:
1. Ensure that MSA controller host port wwn id and host server FC HBA wwn id shows up in SAN switch effective configuration.
2. Disable the switch port to which host server FC cable is connected and re-enable it.
3. Try connecting a different FC HBA port(if server has dual port FC HBA) to another MSA controller FC host port. MSA 2050 would have 4 FC host ports per controller
4. Change MSA FC host port topology to point to point:
Refer to page 56 of SMU guide:
https://support.hpe.com/hpsc/doc/public/display?docId=a00017707en_us
5. Check whether the topology is point to point in qlogic console in the host server.
Restarting the storage controller could also be tried as it will reset the host port link connectivity.