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bad value for restricted picklist field: F2F while sending email
Getting the error bad value for restricted picklist field: F2F while sending email from sandbox.
In sandbox Enhanced email is enabled.
Did someone faced the same issue and found the solution (what need to be done to resolve this).

In sandbox Enhanced email is enabled.
Did someone faced the same issue and found the solution (what need to be done to resolve this).
Do you have a custom picklist field for activity object or any related workflow? Is there somewhere you are setting a value to F2F?