Email 'verification' was Quarantined (Gmail)

Team member set up a new account. Verification code was requested Email never 'arrived' as it was auto-quarantined by Gmail. Checked with CS and customers have had the same issue. Checking the logs the DKIM, SPF both passed so not sure why it got held. May be worth looking in to. Resolution: I had to manually add the sleekplan domain under our Allowlist internally.