Can't run the Post request for key word + item search for connector in test tenant

[litwu426]

1. I test the test tenant admin@a830edad9050849coepFfbb0Smi.onmicrosoft.com for connection with JiraCloudSynthetic20260428 and ConfluenceCloudSynthetic20260428.
2. the get request for https://graph.microsoft.com/v1.0/external/connections/JiraCloudSynthetic20260428 and https://graph.microsoft.com/v1.0/external/connections/ConfluenceCloudSynthetic20260428/schema run success and I can debug the connection IN DevUI with 3S recall successfully.
3. but when I run the post request (see below image), I run successfully before, but failed in recent day, can anyone help on this?