How to set SameSite cookie attribute using Apache configuration?

In my local environment (Apache 2.4) after enabling mod_headers I was able to achive this by adding directives like below in my vhost:

<ifmodule mod_headers.c>
Header always edit Set-Cookie (.*) "$1; SameSite=strict"
</ifmodule> 

Where is the difference? Why it didn’t work for you? Mayby its lack of “space” after semicolon?

<ifmodule mod_headers.c>
# always is similar to "onerrors"
        Header always edit Set-Cookie (.*) "$1; SameSite=strict"
# success is similar to http 2xx response code
        Header onsuccess edit Set-Cookie (.*) "$1; SameSite=strict"
# remove duplications (apache sends from both tables always and onsuccess)
        ## https://www.tunetheweb.com/security/http-security-headers/secure-cookies/
        #Strip off double SameSite=strict settings as using above you can sometimes get both
        Header edit Set-Cookie ^(.*);s?SameSite=strict;?s?(.*);s?SameSite=strict;?s?(.*)$ "$1; $2; $3; SameSite=strict"

        #Strip off double ;; settings
        Header edit Set-Cookie ^(.*);s?;s?(.*)$ "$1; $2"

</ifmodule>

[apache manual] (https://httpd.apache.org/docs/2.2/de/mod/mod_headers.html)

[stack discusion] (httpd duplicate Access-Control-Allow-Origin with "Header always set")