The URL inputs include pattern matching to check if the URLs include "http://." and "https://." respectively. These fields can be inherited from the Matomo Analytics module but this module does not have this strict requirement which can cause the URL to not be applied correctly in some cases. Both modules share similar validation for the URLs other than the pattern matching thus it would be best to remove the pattern matching for the sake of consistency and stability.
I you type in a URL starting with https:// in the http field on the Matomo Analytics module settings it is allowed but if you then automatically inherit the settings for the Matomo Reporting API it does not work because of the pattern matching.
Removal of the pattern matching from the settings form code. A patch has been created to do this.
2.0
Code
We have been using this fix for a while, and is the fix is only removing the line for the pattern is should be fine.
The fix is based on how they handle it within the Matomo module itself.
It is especially useful if you cannot use non encrypted connections.