When I log into Spotify on my iphone it asks me to validate my iphone through email. When I go to the email, the verify button does not give the option when I put the cursor over it.
Apologies for the late reply, but maybe I can still help :)
Have you tried opening the email using an incognito tab, clear the cookies of your browser and use another browser or device?
When this doesn't work, you should try to use another internet connection (e.g. cellular data instead of WiFi).
Have a nice day!