Metro requires one carrier setting before MaskOff can complete its normal guided setup.
Use Metro's account tools or contact Metro support to enable Call Forwarding on your line.
Return to MaskOff and continue the guided activation.
Decline the test call when it arrives.
This Metro step is a one-time prerequisite. After it is enabled, setup continues normally inside MaskOff.
If the test call does not work, follow the remediation shown in the app. You can run it again from MaskOff Settings → Check my setup.
If Metro does not let you enable Call Forwarding, contact Metro before continuing in MaskOff.