Barcode-Wallet
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Failed to create new token
When I click on the + sign I simply just get a message saying 'failed to create new token'

Unfortunately I can't answer you easily. Have you tried on a computer ? Using a computer allow you to open developer console in your browser and display network requests. This will help a lot to try to understand what happens.
I get the same error. This is from console: POST https://data-manager-api.qrcode.macherel.fr/users 429 (Too Many Requests)