Section link:

Suggestion:
Add import package

import uuid
import datetime as dt
from msrest.serialization import UTC

Section link:

Reason:
azure.core.exceptions.HttpResponseError: (BadRequest) Invalid key in aeg-sas-token. Valid format :r=UrlEncodedResource&e=UrlEncodedUtcExpiration&s=UrlEncodedSignature. Input sas string: lrPUpeSQUJEMj3paatULJ1ejvtgMvU4PIy3o+sypQ0w=.

Suggestion:
EVENTGRID_SAS is not an access key, but a shared access signature.
But we unable to find SAS (shared access signature) in event grid topic from the 'Azure Portal'. Only find the access key.
Maybe we should consider this method: sas = generate_sas(endpoint, topic_key, expiration_date_utc) to generate sas.

@jongio for notification.