GMAIL-OTP Issues and Solutions

This video has a solution to the below issues in reading OTP from the Gmail.
Note : If you are a first time visitor ,please watch below video prior watching this one:  How to Automate OTP number using Sele...  where I explained about "How to Automate OTP number using Selenium"
1. Invalid credentials exception (even when you are providing the correct credentials)
2. Missing the "Allow Less secure apps"  settings from Gmail  (google removed this feature)
3. FileNotFoundException when providing the Gmail properties.
4. Retrieving the most recent OTP if multiple unread emails from the same subject line.