Zonneplan integration timeout when requesting login email

Hello, I am trying to get the Zonneplan One integration to work in HASS. My system is a HomeAssistant Green.
I have installed the HACS integration, followed the steps on the github-site for installing the zonneplan integration (GitHub - fsaris/home-assistant-zonneplan-one: Unofficial Zonneplan integration for Home Assistant). I downloaded the files using HACS but also checked if the files have been actually downloaded in the right location (using the file editor integration)
When trying to add the Zonneplan integration I have to enter my mail address, and after I do so I receive the (Dutch) error message “Het opvragen van een login link ging mis”. When I checked the logs I found an error logged by the “zonneplan_api.api.py” (so it has been called), The error message is “Timeout calling ZonneplanApi to request login email”

I checked the api.py-file, version is 4.22.3. I found the listing of the error message, which is in a routine which appears to contact “https://app-api.zonneplan.nl/auth/request” (but trying that in a browser yields an error message, as I suspected it would).

My knowledge of python (and HASS) falls short. Could anyone point me to a solution, are there any obvious steps I have omitted? I am pretty much a noob when it comes to HASS.

OK I found the answer, I used a wrong mail address. Now it works OK