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It was it! Thank you Amanda!

Hi – yes, important to use https/SSL after making a local certificate via mkcert as per instructions in the docs.

And even if you do have mkcert set up, browsers can be a bit too sticky remembering http or https so it can be helpful to empty cache or try another browser.

But if you've done that and are still getting errors, seeing that you are accessing it via 127.0.0.1:8000 in address bar, and have entered localhost into the api key allowed domains, I wondered if you have got 

127.0.0.1 localhost

in your hosts file?

Then you can enter https://localhost:8000 in your address bar

Rather than https://127.0.0.1:8000

Might make a difference?

edit hosts file in windows at

C:\Windows\System32\drivers\etc/hosts

edit via notepad

and in Mac at

/etc/hosts

edited via sudo nano /etc/hosts

Ru

I changed the port to 3000, included the localhost:3000 at the alowed domains and the same error happens.

Hi @Vitor Felippe33472296va7e  --

You don't need to create a new project, you can just edit your existing project in Developer Console. Navigate to the project, click "API Key" on the left panel. Then click "Edit Credentials" on the top right. You can then edit your allowed domains as needed. 

Best, 

Amanda