Business Central Environment Blinking after update to v20

Introduction:

Pre-requisites:

• Business Central Online  v20

Demonstration:

1. Restart the Business Central Environment:

Go to Business Central Admin Center > Select the Environment >Sessions > Restart Environment.

2. Ensure that your URL contains Tenant ID:

When you login into the Business Central Environment, make sure that your links are in the following formats

Sandbox : https://businesscentral.dynamics.com/<SandboxEnvironmentName>/?sandbox=true
Production: https://businesscentral.dynamics.com/<ProductionEnvironmentName>/

If you URL like

https://businesscentral.dynamics.com/SandboxName or any other format without Tenant ID, chances are that you will end up with the issue.

Also, you can login through Admin Center URL - 

Connect from URL in BC Admin Center

3. Check the status if the installed or dependent apps are updated:

Go to Admin Center > Select Environment > Apps

4. Login into Environment through https://portal.office.com:

I have observed that sometimes irrespective of all these steps being followed or not, the issue still does not resolve it self.
Hence, you can go to portal.office.com  > Select Chocolate Button on Top Left > Select the Environment you want to login

5. Login through Incognito Mode:

If nothing works, its possibly the browser cache. A best way to avoid browser cache is use Incognito Mode.
Use Incognito Mode > Login with your Office 365 Account > Open Business Central from Office 365

If the environment is still blinking after trying to login through all the above methods, try to login after 30mins

Note: If you are having this issue in Production and is not resolved after the steps provided, I recommend raising a Production Down [RED FLAG].

Conclusion: