I have an ionic5 application that makes calls to REST api hosted on my server. When testing the application with browser everything works fine. But after deploying to real android device the api call returns status (canceled) with initiator polyfills-es5.js and seems that the call doesn’t even start. Initially I had an ERR_CLEARTEXT_NOT_PERMITTED error but after adding a ssl certificate to the server (zerossl) this error disappeared but instead the https calls return the canceled status.
Is it a certificate problem (zerossl is trusted by browsers but is it by Android) ? Or something else?