Answers
Making your tracking survive Safari
Check Settings → Tracking → How long your cookie lives. If it says 400 DAYS, close this tab and go enjoy your day. If it says 7 DAYS ON SAFARI, read on - it is worth about twenty minutes of somebody’s time to fix.
What is actually going on
When someone clicks your ad, we store which ad it was in a cookie on their browser. Safari deletes that cookie after seven days if the tracking is served from a different host than your website - which is exactly what a t.yoursite.com subdomain is, because it answers from our servers rather than yours. Safari is not being difficult for the sake of it; that pattern is what actual trackers use to follow people around, and you are getting caught in the net.
The damage is quiet, which is the worst kind. Someone clicks your Google ad on Monday, thinks about it for two weeks, comes back and fills out your form - and arrives as a total stranger. That sale shows up in your unattributed line and the campaign that earned it gets no credit. Chrome and Firefox visitors are fine. Safari, and every browser on an iPhone, are not.
The fix: serve tracking from your own site
Instead of pointing visitors at t.yoursite.com, your site forwards requests from yoursite.com/vt/ to us behind the scenes. The visitor’s browser only ever talks to your domain, so there is nothing for Safari to object to, and the cookie lives the full 400 days. Nothing about your site changes visually and nothing new gets collected.
WordPress
Install the MyVitalAssistant Tracking plugin, paste your account ID into its settings, done. It sets up the forwarding and drops the tracking script in for you, so you can delete the script tag you pasted in by hand. Two minutes, no developer.
Your site is behind Cloudflare
Add a Worker route for yoursite.com/vt/*. We will send you the ten lines.
Nginx, Apache, Netlify, Vercel
A short block in your config that forwards /vt/. Whoever manages your hosting will recognise it instantly - email us and we will send the exact snippet for your setup.
Squarespace, Wix, Shopify, Keap landing pages
These do not let you forward a path, so this fix is not available. You stay on the subdomain install and Safari visitors get seven days. We would rather tell you that plainly than let you assume otherwise - and if most of your traffic is desktop Google Ads, the practical damage is small.
Do I have to do this?
No. Everything works either way; the question is only how long a Safari visitor stays recognisable. If you sell something people decide on the same day, seven days is plenty. If your customers think it over for a few weeks - most service businesses - this is the difference between your ad spend looking worthless and looking like it works.