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See these troubleshooting steps:
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-tethered-capture-lightroom.html
Note especially step 5, "Put an empty memory card in the camera, especially if you're using a Nikon camera", but work through all of them.
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Check your in camera USB settings.
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See these troubleshooting steps:
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-tethered-capture-lightroom.html
Note especially step 5, "Put an empty memory card in the camera, especially if you're using a Nikon camera", but work through all of them.
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Are you in the list of cameras?
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I only use a Macbook Pro. Does the Mac Pro use USB C/Thunderbolt connection? Does the tether cable have a USB C connector? Or are you using a USB 3 to C adapter? I found that only the Apple brand dongle would work correctly to adapt my Tether Tools USB 3 cable to the Macbook Pro 2019 16" With that, the D500 tethers fine.
Also, there was an issue with Catlina tethering ok in 15.1 and then not tethering until 15.3 or 15.4.
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Hhmm
Sounds like it might be a report to the forum which is reportedly monitored by Adobe engineers and many others.
Photoshop Family Customer Community
Its a great repository of help Bruce.
Hope that is of some help.
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Adobe helped me solve the problem. I moved to Lightroom Classic Version 9.3. There were incompatable software issues bewteen Catalina and Lightroom which have now been resolved. Using latest versions has done the trick, even though Lightroom Classic CC Release 7.4 was meant to work. Happy bunny now. Thanks EVERYONE.
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"Using latest versions has done the trick, even though Lightroom Classic CC Release 7.4 was meant to work."
Thanks for the update -- that will help others. Updating to the most recent version of LR is the first troubleshooting step.
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