@psoro Jose when you created the QR code do you know what version of the Blynk server you were using?
When I scanned the QR it "blew up" my Samsung S3.
Perhaps I should elaborate on the term "blew up" and just to add my S3 is a busy, low memory device.
Blynk app locked up and screen went black. Restarting the app showed that your project had been added to my dashboard. Not actually flashed your sketch yet as all my USB ports are busy at the moment.
Noticed one of my WeMos' that was attached to my laptop when the QR code was scanned repeatedly showed invalid token in Serial Monitor. Checked the project and the local server, tokens matched despite the message in Serial Monitor.
Refreshed the token in the project and reflashed the Wemos, all fine now.
My understanding is that QR codes are server specific i.e. if you clone a project with server x.x.x and then try to run with server y.y.y it can create problems. Normally a refresh of tokens etc will fix the issue.
For reference my local server is 0.21.5.