Finding the right link for each platform
For Google, open your Business Profile and use "Ask for reviews" — it gives a short link that lands on the star dialog. The Place ID route works too if you have it. For Yelp, TripAdvisor, Trustpilot and Facebook, paste the full write-a-review URL from your own page on that platform; a non-Google value that is not a URL is encoded exactly as typed, so it must be the whole address.