"Sign In" button disabled in android webview

[printappdev]

Hello.

Our device doesn't have a browser. so I used android webview for OAuth login.

Previously I could sign in to Dropbox.

But I can't sign in to Dropbox today. Because the "Sign In" button disabled like the picture below.

Do you have any ideas?

Are there any changes about OAuth?

I  could see the log like this.
I/chromium: [INFO:CONSOLE(1)] "ReferenceError: Set is not defined
at https://cfl.dropboxstatic.com/static/compiled/js/packaged/pkg-react-16.7.0-prod.min-vflobB39P.js:5:3...
at https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:25707
at o (https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:25060)
at Object.i.execCb (https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:25683)
at Q (https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:4398)
at Object.K [as depFinished] (https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:4865)
at https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:5382
at https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:16674
at P (https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:16708)
at https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js:1:14607", source: https://cfl.dropboxstatic.com/static/compiled/js/alameda_bundle/alameda_bundle-vflQMGmbi.js (1)

Our Device android version : Android 4.4.2 (KitKat)

Thanks

[Greg-DB]

Thanks for the report. The Dropbox web site is subject to change, and only officially supported in the browsers/versions documented here.

It sounds like the Dropbox web site is now using a JavaScript feature that the webview you're using doesn't support. (Based on the error output you shared, it appears to be the "Set" object.)

Unfortunately, that version of Android, and accordingly the browser engine in its web view, is old, from around 2013, and isn't officially supported by the Dropbox web site. That being the case, I'm afraid we can't offer help for it. I highly recommend updating to a supported browser version.