Appears to be working fine for me, fresh project using sendgrid:
After confirming via the email, the token is removed and confirmed boolean is set to true:
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I’m guessing the issue is with some code that’s messing with your response (since you can see the confirmation is working in the database)
sorry it’s a big screenshot) :
Side point though 
that initial confirmed value should be false, not null. Unrelated but should probably put in a bug report for that.
@DMehaffy 
Thank you very much for the first time and I will keep going until I find it 
. As soon as I find out what the problem is, I’ll report it to you. 
Please do. 
@DMehaffy I looked at it again. At first I got the status 302, but the “response” is “Undefined” (“message”: ‘Network Error’)? If I execute the confirmation again, I get the status 400.
What status code do you get, 302?
P.S.: When I open “config”, I get the following infos. Is there a hint?
When you actually use the token yes you will get a 302 to the url you set in the admin panel to redirect the user.
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What URL have you defined in the admin panel?
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Also, can you check browser console logs? As I see you attached screenshots only from the debugger.
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@sunnyson I am very happy that you are helping me too! 
- What has to be defined in the admin panel?
- It’s really very interesting. In console logs I get “GET https: // localhost:4300/ net :: ERR_SSL_PROTOCOL_ERROR”. That could really be the solution. I wrote my front end in Angular. Do you have a hint for me?
@sunnyson and @DMehaffy
Thank you for the good tip! 
The problem is now solved! 
I accidentally entered “https: // …” in “Redirection url”. 
Now I’ve learned something again! 
Best greetings! 
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Yeah, that’s exactly what I was expecting to see in your console log and redirect URL. You’re welcome! 
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Yep!
@DMehaffy @sunnyson 
Excuse me, I have one more question to ask. I deployed my Strapi app on Heroku. Regardless of what I put in “Redirect URL”, I get the status code 400. What could be the problem? Do I have to enter something in “server.js”?
After you deployed in heroke you should put your Public address instead of localhost into the redirect url.
@sunnyson Yes, I entered “https://my-app-name.herokuapp.com”, but I still got 400.
P.S.: I found the link below, but didn’t understand it.
node.js - Change redirect url for Google provider in Strapi - Stack Overflow
@sunnyson @DMehaffy Oh, I understand, my strapi-back-end address has to be entered, not mein front-end address. 
Now I can fall asleep better. 
Many thanks!
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Where did you find back-end address? I’m also on Heroku.