Does your remote access setup work for you when you’re testing it while not being on vacation (but obviously outside your home network)?
I’ve experienced some vacation homes offering WiFi and internet access… but only offer some restricted „guest access“ that’ll block any non-standard ports — hence effectively blocking you from accessing your server from their place (while remote access via a mobile connection might work but that’s obviously not helping, unless you have an unlimited data plan).
If it’s generally not working for you… to what exact output / findings did you troubleshoot it?