GMail app not displaying signature

**Issue:** When replying or creating a new email, the signature does not load. How to replicate: From the GMail app: Settings - mail@mail.com - Signature - set any text - create a new message Notes: there's no Google Account set on this phone. The GMail and Google Play Services APKs were downloaded from APKMirror What has been tried: - Setting up Exchange and YahooMail accounts - Clearing the app's data and reinstalling it - Restarting the phone - Changing the phone's language from Brazilian Portuguese to English (United States) What else can I try? Thanks in advance GMail versions tested: 7.5.21.158049789.release 7.5.7.156101332.release Google Play Services versions tested: 10.2.91 (430-144333517) 11.0.55 (430-156917137) Device: Moto G4 Play (harpia) Android version installed: 6.0.1 (stock, non-rooted)