Kerning on extended selections can only be set to Auto or 0
This is back in 23.0.1 - fix this for good already Adobe

Please accept my sincere apology for the inconvenience. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
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Max Tovar commented
now on cc24.1 and STILL NOT FIXED, please take care of business Adobe! we re paying for it!
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Anonymous commented
How do I fix this????
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Jorge Torres commented
same here, I´d rather ***** this *** software on a functional version than pay each month for a set of broken products!
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Glenn commented
It's back in 23.0.01 - What a pain
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Jas commented
Same here. Mac and I have an updated version of Illustrator.
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Mr Dowding commented
Same issue again but on a PC
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Anonymous commented
I am having the same issue as well
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Anonymous commented
Kerning is no longer functional in the current update of Illustrator. A previous user had this problem and the response claims that the bug has been fixed, but it is still not working.
Whenever I try to adjust the kerning of letters, I get this error message:
"Kerning on extended selections can only be set to Auto or 0. To modify spacing between multiple characters, use the Tracking option.
I am running Illustration version 22.1.
My Mac runs system 10.12.6. -
Anonymous commented
I'm having the same issue, even with just the one text box. I'm trying to change the kerning to "Optical", but before I even have a chance to click on anything this warning comes up. I can't click okay or get out for the dialog box either. Many force quits later, this is getting very old.
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Megan commented
I've encountered the pictured error/warning dialog box a couple of times now when trying to change attributes on a selection of several text boxes. I am actually only trying to set the value to '0', but it seems easy to trigger this error inadvertently.
Each time I have encountered it, I cannot click 'Okay'. It is impossible to dismiss the dialog box and I've had to force quit the application.
I am using CC2018 on a Mac with High Sierra.