New WLAN hotspot: connection to the Internet fails

I’ve been connecting my car to the Internet for 2 years via a WLAN hotspot, which I provide to him via my mobile phone. So far, this has always worked perfectly, with my two mobile phones, which I have professionally and privately, both are Samsung Galaxy S5. Now I have a new device, a Google Pixel 4a. Also with this I create a hotspot, with which the car also successfully connects, which shows both the menu in the car and the mobile phone. If the car doesn’t get information from the Internet via the hotspot, for example, calling the Carnet apps fails after about a minute. Traffic information is not retrieved either. The globe in the display remains pale and does not show a Wi-Fi lettering. If I connect to my laptop with the same hotspot on the new mobile phone, the Internet access works wonderfully, so it is not a fundamental problem of the hotspot or mobile phones. he hotspot of the professional mobile phone still works as usual. Only with the hotspot of the new mobile phone there is an inexplicable problem for me. Does someone know the problem and have a tip for the solution?