If you still have a device running Android 2.3.7 (Gingerbread final) or older, Google will not allow you to sign in to your Google Account on that device from September 27, according to the supporting document (through Liliputing).
“As part of our ongoing effort to keep users safe, Google will no longer allow sign-in to Android devices running Android 2.3.7 or earlier, as of September 27, 2021,” the company says. “If you sign in to your device after September 27th, you may receive username or password errors when trying to access Google products and services, such as Gmail, YouTube, and Maps.”
Android 2.3.7 was released almost 10 years ago to give you an idea of how old your device will be affected by this change. But given that there are more than three billion active Android devices in the wild at the moment, this change is likely to affect more than a few people who may still stick to older technology.
If you are running Android 2.3.7 or earlier by September 27th, you can still use some Google services if you are signed in with your device’s browser according to Google. But Android 3.0 (Honeycomb) devices can still sign in to Google accounts, the company says, so if your older device can be upgraded, you might want to do so.