Ran into this error message
Configuration Invalid for Config: MessageTemplate, Value: 'DeleteMe', Reason: not recognized for locale en_US
Only when creating new notifications linking to specific templates. This message appears and then goes away. Not always reproducible.
Temporary caching issue in Message Templates processing.
Saving the new Message Template quickly right after making some changes.
Release : SAAS 20.6
Component : OI Message Templates
Wait a moment before saving the newly created notification under Channel.