Thanks, unfortunately this didn’t work quite well. But you are right about DigiCert, I was referring to the unkown certificate that CF creates (the intermediate CA called Cloudflare ECC CA-3 shown below)
I installed the exported certificate with this format:
On the device, the certificate appears as unverifiable:
When I click View Issuer there, it shows CF cert as unknown:
And when I click View Issuer there, it shows the valid cert from DigiCert you mentioned:
(all screenshots can be enlarged)
Side note: On the Intermediate Certificates tab from BB desktop tool, Cloudflare Inc ECC CA-3 was unchecked (not installed?). I checked it, synced certificates and now it appears as installed.