Error: Access Blocked. Monaco is not approved by Advanced Protection

This error occurs when you try to connect a Google account that has Google's Advanced Protection Program enabled. To resolve this, you must either turn off Advanced Protection on that account or connect a different mailbox.

Context

When attempting to connect your Google account to Monaco, you may see an error message from Google stating: "Access Blocked. Monaco is not approved by Advanced Protection."

Why this happens

This error occurs because the Google account you are trying to connect has Google's Advanced Protection Program enabled. This security tier only allows Google-vetted applications to connect via OAuth. Because Monaco is not on this Google-curated list, Google blocks the connection flow before it reaches Monaco.

Google does not allow users or Workspace administrators to manually add Monaco to an allowlist for the Advanced Protection Program.

How to resolve it

To resolve this issue, you must choose one of the following options:

• Turn off the Advanced Protection Program on that Google account.
• Connect a different mailbox that is not enrolled in the Advanced Protection Program.