Remote control visible in Google TV but not in Google Home

[Botton]

I own 3 smart TVs. A Sony Bravia (32"), Sharp Aqous 40" and Sharp Aqous 55". The Aquos of 55" is the youngest.
Now I see all 3 in the Google TV app including the remote control. And in Google Home I also see 3 TVs, but I can only open the remote control of 2 of the smallest TVs.

This means that I cannot access the Aquos 55" with voice control with my Nest Mini. I am then advised to connect the TV to WiFi, while I can cast my screen to the TV via Google Home. being able to cast means that the TV is connected to WiFi.

[Botton]

In addition:
Everything has been updated to the most current version.
I compared the settings of the TV that does not show a remote control with the TVs that do work. No differences.
I tried it 2 android phones and 1 tablet. I have a remote control with all three in Google TV, but not with the Sharp Aquos 55" in Google Home.
The Tuya lighting linked to Google Home works perfectly.

[Botton]

I guess I've already found part of the problem.
First of all, I think the applications involved are:
Google Home, Google TV and Google Assistant
Now I have done a factory reset on the TV that did not connect. After this reset, Google responded when I said "hey Google TV on" (in Dutch).
When I changed the name of the TV again to: "Studio 10 TV" I got the answer: "no TV found, Connect the TV" or something like that
I then changed the name to: "Studio_10_TV" (connected with underscores), after which I did receive a response via the Google Nest Mini. The TV turned on.
It is striking that Google Assistant no longer responded via the TV remote control.
I also still don't see the remote control in Google Home and it has also disappeared in Google TV. it looks like it's alive. The TV is found by both applications.
Operating the TV using the Nest Mini is also a challenge. If I say: "Hey Google turn on the TV to channel 17" or Hey Google, Live TV channel 17", then Google will always search for something with channel 17 on YouTube.