Unable to add the Spectrum Data Source in Portal because the username and password fields are not editable.
Performance Management 23.3.11
This is a known issue fixed in 23.3.12
Symptom: When adding Spectrum as a data source, on the Add Data Source dialog, the Username and Password fields are not always editable (they are disabled).
Resolution: With this fix, the Username and Password fields are now always editable.
(23.3.12, DE605488)
As a workaround try choosing a different Data Source and come back to Spectrum, that will make them available to modify.