"Error 403: disallowed_useragent" when trying to sign in to Dropbox to access Excel file

[Jojo26]

Please help.

I'm using a Pixel 6 with Android version 12 updated 7/5/22.
I was trying to open an excel file on Dropbox with Excel.

It then brought me to this page saying "Sign in to Dropbox to link with Microsoft Office Integration" in the Excel app.

I chose "Sign in with Google" since that's how my Dropbox was setup.

After entering my email and password, it told me "You do not have any security keys registered for this account.", so I chose "Try another way".
Then I chose "Tap Yes on your phone or tablet", which then caused Google to send me a notification asking "Are you trying to sign in?"
I chose "Yes, that's me.", then the Authorization Error page showed up, with the following message:

Authorization Error
Error 403: disallowed_useragent
You can’t sign in from this screen because this app doesn’t comply with Google’s secure browsers policy. If this app has a website, you can open a web browser and try signing in from there. You can let the app developer know that this app doesn’t comply with Google’s secure browsers policy.
Learn more
Request Details
The content in this section has been provided by the app developer. This content has not been reviewed or verified by Google.

If you’re the app developer, make sure that these request details comply with Google policies.
access_type: offline
response_type: code
redirect_uri: https://www.dropbox.com/google/authcallback
state: AEUsuIs8OQySq1VSFnon67dFc_FydDewiIszVox3FZgRq5c-QhRqMi982uAgntpnaf2s1KTir_WkS530pyHg0XyHzXmHFOlISfz-aW94r3p95Ig6tkV1j0PIdHGEm2Vhve1scZi3cu_z54DwvTIGwf27CpygqOI0g0am4hapKJobvtq0i454NQcOab64_numvj6MJjEWB1Kerj1WaYvV1VTTLd18JsS8AGqZaJNee3-j7QAKHUbQSVoPwEL_Lm0PqrUhfNUDidwIlEDD1NgAfEoegRYvlJz4W9co6FCW0S071X54bkpQhL0OglfZpdGMBfb-ZSoPrXugIQGVIl8TDK67GRwsU75fUrpBAWuiMJ3FZB6Fly86HO8rrDAig3erLc7kym7D0ROc3t0pBjho2uKfGbPKI1oDrizEI4BsWFZ0Mu6ZwWS0VvpflM4mIuyhIJ-fRY3RoFDAlaOT5QmkURgMTg9S6-EOJCFxRzNvzk1E2OJO4PZ-rLXad0orJ_CpdhFhMEbQDHRZyKqc29oGMXAj9HKeZHswwU6uIp99dTT966IHvourCbQPWzDhQQ8abDahwVxr36bYyYtelB2SlN15tTAVhJqNxOIkGR67yLPH-D9Hnhr-T0tXqg2gyRsWUTrP_smAzslRn8nrCayPeA4zHC62vXikjmjgdyCAeucqZgKZdSZTgWvKfWdiwWplCGbL7yKrKo6LNd2CwYe9b4uG
prompt: select_account
client_id: 801668726815.apps.googleusercontent.com
include_granted_scopes: true
scope: https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/contacts.readonly https://www.googleapis.com/auth/contacts.other.readonly openid 

[Hannah]

Hey @Jojo26, thanks for reaching out to our Community.

I've found this article on the Microsoft support page, can you take a look and let me know if it helps at all?

Thanks.

[Jojo26 · Accepted solution]

Sorry I don't know what happened, but when I tried the same thing today, it did not ask me what app to open the file with and directly opened it with Excel.
It asked me if I would like to link Dropbox to either Microsoft or Google (I didn't read carefully), then the file opened without much problem.