You cannot access Qlik Sense because you have no access pass - intermittent problem

What is key to this specific scenario is that it is intermittent for a user(s), otherwise this does not apply.

In Qlik Sense June 2019 and later, the error message includes:
 

 

Too many parallel sessions active for the same user

The Qlik Sense hub is accessible, but sometimes fails to load with the error 

You cannot access Qlik Sense because you have no access pass

To reproduce this problem this problem, you will need to open 5 simultaneous sessions* to the Qlik Sense Hub. If you open a 6th one and open an application you will get this error message

*Simultaneous sessions: To open different session, there are several way to achieve that.

• You can open the Qlik Sense Hub from different machine using the same username
• You can open the Qlik Sense Hub from different browser using the same username
• You can open the Qlik Sense Hub using different virtual proxies using the same username

Opening several tabs in your internet browser will use the same session
 

For additional troubleshooting steps unrelated to parallel sessions and other root causes, see:

Qlik Fix Video: You cannot access Qlik Sense because you have no access pass

Article: Qlik Sense April 2018 and later- Service account getting "You cannot access Qlik Sense because you have no access pass"

Environment: 

See the Qlik Sense Online Help on Managing licenses for details. 

"The maximum number of parallel user connections for a single user of this type of access pass is five (5).If you use a license with a signed license key, accessing the QMC also counts and adds to the maximum number of parallel sessions, which is five. To avoid unnecessary session consumption, the root admin should not be allocated any type of access."

This is working as designed. Prevent the use of multiple sessions at the same time for one user. 

For troubleshooting steps in case of the service account being locked out due to too many sessions, refer to Qlik Sense April 2018 - Service account getting "You cannot access Qlik Sense because you have no access pass"