I had OPN 1 miniRITE aids but am now using OPN S 1 miniRITE. I also have a ConnectClip. I use an older iPhone 6 Plus - it will not run iOS 13 so is at 12.4.5. That version was released about when 13.3 was for newer iPhones.
When I got my ConnectClip, the provider had to program the aids to know about the clip (at least that is what I was told). Also, the firmware of the OPN 1 aids had to be upgraded to allow use of the clip (some time back when the clip was originally released to the US). At a later point, there was a firmware update for my ConnectClip - it is at firmware level 1.13.0 now.
So I would suggest that you ensure that the firmware for both your hearing aids and the ConnectClip are current. I found a download of Genie II (from the UK) and that includes a firmware update program that runs under Windows 10. You can plug the ConnectClip into a USB port on the computer with an appropriate cable and the program will tell you the firmware level and if it is current. The Oticon ON app on iOS will report the software level of your aids. My backup OPN 1 aids were updated to 6.1 on 1 October 2019. The older version of the ON app on iOS reported both software and firmware levels - 6.1 and au2cs3fw5.16.1 for my OPN 1 aids. I do not know if there is a more recent version as I switched to OPN S 1 aids last September.
If your firmware/sofware is not up-to-date, I would get that done by your provider before trying anything else. If you are up-to-date, then I would remove all pairing from the ConnectClip. Then I would pair the ConnectClip with the hearing aids and then the phone. I would probably also forget and redo the pairing of the hearing aids to the iPhone.
Then I would turn off the ConnectClip and ensure that both hearing aids are correctly connected to the phone. Next check the settings for audio routing in your iPhone: Settings --> General --> Accessibility --> MFi Hearing Devices --> Audio Routing --> Call Audio to “Always Hearing Devices”. The MFi Hearing Devices screen should also show both hearing aids (R + L) and Connected. Use the > to check that both are set to stream. I suggest “Adjust Independently” be turned off unless you really want that.
If you have multiple iOS devices (iPhone and and iPad or similar), you might turn off all except for the phone during setup/testing - I have issues when both my iPhone and iPad are near the hearing aids as they seem to fight for control.
For calls at home, I just place my old iPhone on a desk in front of me and leave it there for “hands-free” calls. The phone audio reliably connects to both hearing aids during phone calls for me. I don’t typically use the ConnectClip for phone calls, only for connecting to a computer. If you need hands-free calls in a car that doesn’t connect to your phone, you might try putting the phone in a shirt pocket with the mic pointing up - some have reported success that way. I don’t use my phone while driving a car (or riding my bicycle).
I have tried the ConnectClip with my Cisco VOIP, bluetooth enabled desk phone at work. The ConnectClip shows up as a bluetooth headset. People I call have reported that the ConnectClip microphone volume is too high and it is too sensitive so there is significant background noise (HVAC fan for example) heard. This was supposed to be fixed in the firmware update for the clip but my experience doesn’t bear that out. So I don’t use the ConnectClip for phone calls in my office. I just use the iPhone placed on my desk so my hands are free for taking notes or whatever.
If you aids and iPhone are working correctly, call audio to your OPN 1 aids should “just work” for both ears - no need for the ConnectClip for that as MFi in the phone does that. If the aids and ConnectClip are at the correct firmware level and paired, the ConnectClip should also work but the volume/sensitivity of the clip microphone may be too high, at least in my experience.