Why cannot find the option to modify SMS signatures?

Currently, the Cloud Development Console uses the V2 version of login authentication and does not support using custom signatures.

Users using the legacy V1 login authentication can configure it in the legacy Cloud Development Console. However, V1 login authentication will be gradually phased out. Please migrate to V2 as soon as possible. How to migrate

Reasons for SMS sending failure with custom signatures

Due to changes in carrier policies, custom signature SMS for V1 login authentication may be intercepted. Please switch to the Cloud Development unified signature SMS.

For Enterprise Edition and above users who have configured custom signatures and are unwilling to switch to the V2 login authentication, please contact customer service.