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It seems like you have tried a variety of approaches without success. So, setting up unique accounts for each subdomain could be a step to consider. However, before you go down that route, it may also be worth double-checking the basics. Ensure that the gtag.js tag has been correctly placed on all pages of the subdomains and that tracking has been correctly enabled. Configuring Google Analytics to accurately track traffic across multiple subdomains can be tricky, so it might be also beneficial to get professional assistance from a specialized analytics consultant. They would be able to troubleshoot deeper into the configuration of your client’s Google Analytics settings and help implement a solution that captures all the required subdomain data.
