On the website for Options+ in the UK(https://www.logitech.com/en-gb/software/logi-options-plus.html#join-beta), when you click on FAQs & Troubleshooting, it takes you to a non-english page - https://support.logi.com/hc/de/articles/1500006416522

Also, if you already have the MX Master 3 for Mac mouse paired, it is not clear how you then pair it through bluetooth