Believe it or not, the solution to this error is simpler than you imagine. A simple restart of the PS5 is enough to correct this error code, which will make the Share button work again.
To restart your PS5 console you will have to press the PlayStation button on the controller to access a menu> select the power button> press the power button and you should see a variety of power options, including Turn off PS5> select shutdown and wait 10 to 30 seconds before turning it on and voila, the problem should be resolved.
If you cannot correct the problem in this way, you will need to contact Sony technical support for direct help, although they are probably working on a solution.
That's all you have to know about how to fix error code CE-106873-5 in PS5, we hope you have managed to correct the problem and will not come across it again.