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Homey can't reach Tado, strange errors and faults

Hi, there!

Been an avid user of Tado and Homey in combination and it has worked as charm but now I can't reach my Tado on three different occasions:

1) I can't reach the Tado app using Wi-Fi but I'm able to reach it using cellular - it's frustrating.

2) I can't control my Tado thermostats through Homey as it gives me an error reading: "Hostname/IP does not match certificate's altnames: Host: my.tado.com is not in the cert's altnames: DNS.*.receipt-bank.com, DNS:receipt-bank.com"

I'm confused by the DNS namespace, as that's an unknown DNS for me.

3) I can't add any Tado thermostats through Homey as it gives me an similar error reading: "Hostname/IP does not match certificate's altnames: Host: my.tado.com is not in the cert's altnames: DNSprometheus.staging.breedr.tech (something, looks to cut the string)"

Again, I don't understand that DNS or wording.

Any idea on these?