Instead of wasting admin's time in their dev environment, throwing a load of weird page errors and having an utterly broken interface (CSS won't load, etc) why not just state in the documentation that it requires a full license to install and use?
It's not stated anywhere that it's a requirement, and I had to dig into index=_internal log_level=ERROR source="/opt/splunk/var/log/splunk/splunk_app_cloudgateway.log" to find the issue.
2019-10-23 21:24:39,035 ERROR [subscription_clean_up_modular_input.app] [subscription_clean_up_modular_input] [do_run]  Failure encountered while running Subscription Clean Up
Traceback (most recent call last):
File "/opt/splunk/etc/apps/splunk_app_cloudgateway/bin/subscription_clean_up_modular_input.py", line 51, in do_run
File "/opt/splunk/etc/apps/splunk_app_cloudgateway/bin/spacebridgeapp/subscriptions/subscription_clean_up.py", line 36, in run
users = get_all_users(self.session_key) + ['nobody']
File "/opt/splunk/etc/apps/splunk_app_cloudgateway/bin/spacebridgeapp/rest/services/splunk_service.py", line 87, in get_all_users
File "/opt/splunk/lib/python2.7/site-packages/splunk/rest/__init__.py", line 533, in simpleRequest
LicenseRestriction: [HTTP 402] Current license does not allow the requested action
I have submitted this issue on the documentation page.
if you're running Splunk with the free license, you'll get the following error on the 'register' page: Unable to register device. SAML authentication is unsupported with Splunk versions earlier than 8.0.0.
The Trial license works (allow for registration of devices). I have tested with Splunk 22.214.171.124 on Ubuntu 18.
I understand your frustration but please us the docs feedback (not comment) that is provided on every docs page. This way, the docs team can actually read it, reply to you and change their docs in case a change is needed.