Hey,
You can try removing your Discovery Portal and Favorite targets and add it from scratch. As the next step, you try connecting to your target. Might help: https://learn.microsoft.com/en-us/troubleshoot/windows-server/backup-and-storage/iscsi-initiator-not-login-to-favorite-targets
As another option, you can use StarWind VSAN as an alternative to create iSCSI target on top of your storage.
https://www.starwindsoftware.com/starwind-virtual-san
Cheers,
Alex Bykovskyi
StarWind Software
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