1 Run vsce publish:

After providing the PAT, run the vsce publish command again.

The error should no longer appear.

2 Security Best Practices

Secure Storage: Store your PAT securely. Avoid submitting it to version control or sharing it publicly.

Limited Scopes: Grant only the necessary scopes to your PAT (in this case, "Marketplace (Publish)").

3 Expiration:
Set an appropriate expiration date for your PAT.

Environment Variables: Using environment variables is the most secure way to provide your PAT to vsce.