Steps to reproduce:

1. Open: Users -> Authentication -> LDAP
2. Enable LDAP
3. Click Add LDAP server
4. Check the checkbox Configure JIT provisioning
5. Click Add Media type mapping
6. Fill mandatory name and attribute fields
7. Add leading / trailing spaces for the default value of the "When active" field
8. Click Add media mapping

Result:
Cannot add media mapping due to issue: Invalid media type mapping configuration.
Incorrect value for field "period": a time period is expected.

See screenshot:

Expected:
Trailing and leading spaces should be trimmed for "When active" field, similar as it is working for user configuration.