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If the authorization goes through, you will be returned to the Front Desk
Problems with MANUAL Authorizations
If there was a problem with the authorization, and using MANUAL, you will be give a warning at the top of the booking. You can then attempt to authorize a non-present credit card.
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If the card still cannot be authorized you should ask the guest to speak to their issuing card bank to clear up any security holds. Or alter the guarantee by to a different payment method or different credit card. If supported by your property, use an alternate method of payment for Guarantee By such as a check, travelers check, or cash.
Problems with Automatic Pre-Authorizations
If your PMS Setup area for Night Audit is set Allow Credit Card pre-Auths: Automatic, then any auth errors are reported as MyGuest requests so that each booking that fails can be dealt with by the Users set to manage 'Self Checkin' events.