SSAS error deploying project: Ensure that 'SQL Browser' service is running After successfully building my project, I got this error when deploying it:

The project could not be deployed to the '\SQLEXPRESS' server because of the following connectivity problems :
A connection cannot be made to redirector. Ensure that 'SQL Browser' service is running.
To verify or update the name of the target server, right-click on the project in Solution Explorer, select Project Properties, click on the Deployment tab, and then enter the name of the server.

Things I've checked/tried so far:

Changing the deployment server name (from localhost to my actual SQL Server name)
Making sure SQL Server Browser service is running (which is running in SSCM)
Registry SSrpListener value (should be 1 -- mine is 1)
Running both Visual Studio and SSCM as administrator

Versions:

Visual Studio Community 2019 (16.9.2)
SQL Server Data Tools (16.0.62103.10080)
SQL Server Analysis Services (15.0.19445.0)
SQL Server Configuration Manager (2019.0150.2000.05)
SQL Server Management Studio (15.0.18369.0 or v18.8)
SQL Server 2019 Express (15.0.2000.5)
Windows 10 (10.0.19042)

Based on the information I've provided above, I still could not deploy the project.
i'm not sure to have a good view of what you are doing...
But i can say that SASS service is not included with sql server express. You can only have the reletional database service .\SQLEXPRESS, not the analytics database that is SSAS.
https://docs.microsoft.com/en-us/analysis-services/analysis-services-features-supported-by-the-editions-of-sql-server-2016?view=asallproducts-allversions
Instead of Express edition, download devenloper edition. It's free for not production env and full of features like enterprise edition. So you can test everything. Don't use it in production.
During sql dev setup be sure to select SASS instance too: