If a user tries to use "Tag Subject" action with a string that contains only multi-byte characters as "Subject line text" in "Email Impersonation Control Settings", the operation will fail with the following error.
The subject tag you have entered is not in a valid format. Refer to the Online Help for details.
The subject tag you have entered is not in a valid format. Refer to the Online Help for details.
Email Security.cloud
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Workaround is to include at least one single byte character in "Subject line text"