Did you import your Nostr private key that starts with nsec into getalbys nostr tab? Basically go to your extensions click alby then click the discover tab will look like this.

Click Nostr then under private key paste your private key for your account. Remember this is something you should never give anyone because gives access to your account so only paste it here and no where else.

Then go to primal.net and now the getalby extension should pop up and help you log into primal.