[ISSUE] Token Lifetime Exceeded Error when Using Unity Catalog Connections

[benswatling]

Description
When using Unity Catalog connections, along with the API functionality to connect to SharePoint, we occasionally get this error:

databricks.sdk.errors.platform.Unauthenticated: unable to parse response. This is likely a bug in the Databricks SDK for Python or the underlying API. Please report this issue with the following debugging information to the SDK issue tracker at https://github.com/databricks/databricks-sdk-go/issues. Request log:```POST /api/2.0/external-function

<   "error": {
<     "code": "InvalidAuthenticationToken",
<     "innerError": {
<       "client-request-id": "2256907e-4df5-4b04-b6e3-481c768ac42e",
<       "date": "2026-06-05T19:15:19",
<       "request-id": "2256907e-4df5-4b04-b6e3-481c768ac42e"
<     },
<     "message": "Lifetime validation failed, the token is expired."
<   }

Reproduction
It seems to happen when I call these functions over the course of a few hours. It seems like the UC Catalog connection isn't refreshing the token.

Expected behavior
No errors to happen.

Is it a regression?
I do not believe so

Debug Logs
Stack Trace below. Context: custom functions are used to call the API.

databricks.sdk.errors.platform.Unauthenticated: Traceback (most recent call last):
  File "/Workspace/Users/c9633514-a365-47b6-a0a2-81b60f63c58d/benswatling/.bundle/data-dap-bronze-emr-bundle/dev/files/src/raw/MV/meta-sharepoint/sharepoint_file_metadata", cell 3, line 34, in sharepoint_file_metadata
    content = download_sharepoint_file(get_sharepoint_file_download_url(file_path, site_name))
                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/ih_ea_python/ih_sharepoint.py", line 206, in get_sharepoint_file_download_url
    file_results = get_sharepoint_file(file_path, site_name, sharepoint_drive_name)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/ih_ea_python/ih_sharepoint.py", line 171, in get_sharepoint_file
    drive_id = get_sharepoint_drive_id(site_id, sharepoint_drive_name)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/ih_ea_python/ih_sharepoint.py", line 144, in get_sharepoint_drive_id
    return get_default_sharepoint_drive_id(site_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/ih_ea_python/ih_sharepoint.py", line 124, in get_default_sharepoint_drive_id
    r = WorkspaceClient().serving_endpoints.http_request(
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/databricks/sdk/mixins/open_ai_client.py", line 169, in http_request
    res = self._api.do(
          ^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/databricks/sdk/core.py", line 92, in do
    return self._api_client.do(
           ^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/databricks/sdk/_base_client.py", line 197, in do
    response = call(
               ^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/databricks/sdk/retries.py", line 59, in wrapper
    raise err

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/databricks/sdk/retries.py", line 38, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^

  File "/local_disk0/.ephemeral_nfs/envs/pythonEnv-940343c1-cb32-4425-8af0-7f35b58443c3/lib/python3.12/site-packages/databricks/sdk/_base_client.py", line 299, in _perform
    raise error from None

Other Information
Context of error: Serverless Declarative Pipeline, notebook tasks with the most recent databricks SDK.