@ahaw021, not from my side, Firefox browser works fine but Chrome is not as ISRG Root X1 is not included in my Windows version and that is the intermediate certificate server by
I’m off work today and I don’t have my “English” laptop near so the language of below screenshot is in spanish but you will see that ISRG Root X1 is red marked because it is not included in Trusted CAs.
The same in Android (tested with Boat Browser, Opera an Chrome), I receive an error:
NET::ERR_CERT_AUTHORITY_INVALID and is because ISRG Root X1 is not yet included in the trusted CAs.
That is the reason I advice @allan to remove the intermediate certificate issued by ISRG Root X1, because for me… and sslabs it is serving this one always instead of the one signed by DST Root CA X3.
Edit: Just to give more info, I installed Firefox browser in my Android device and the site is working fine because Firefox uses its own trusted CA store.