Hello,
DNS can address only 63 chars, so if your application ID is longer than 23 chars ("ah-builtin-python-bundle-dot-latest-dot-" are 40 chars, so 40 + 23 = 63), it will fail when you try to access to the datastore admin.
Change your application ID (or better said, create a new one, cause you cannot change your App's ID).
Best regards,
Jesús.