Graeme

Email message below.
Clicking the GET YOUR NEW TAG link takes me to Google Analytics: Admin > Property > Tracking Info > Tracking Code.
On this screen I see the gtag.js code.

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I think I’ve fixed it!
I had cloned the main site belowthekowhai.nz using the Softaculous staging tool to perform update testing.
This created an exact copy of the main site at dev.belowthekowhai.nz
The cloned copy included the WooCommerce Google Analytics Integration plugin, with the main sites GA tracking code in the settings.
I wondered if this may have created a confilict, so,
I created a new property in GA for the dev. site and entered that tracking code in the plugin settings on the dev. site.

I have since seen 2 of 2 transactions from the main site showing in the original GA property so far!

I’ve added some more info also, hoping its helpful.
Please let me know if I can give any additional info to help progress this.
Missing a lot of transactional data over the last few weeks and would like to get it back flowing through.

Thanks @marcanor
I had this same issue, I followed your steps and the message is gone from my site now.

Update:
Without making any changes, on 26 April 2020, 2 transactions totaling $40.00 were recorded in GA. This is only part of that days sales, there were 5 orders that day totaling $104.00. But it shows there is connection between the two.
The week prior to this, and the days following still show zero transactions (should have been around 50 orders showing)

Hi @grigaswp

I have used analytics tracking via a different plugin for years.
I recently have started using variable products, which the previous plugin would not track sales for.

I removed that plugin and installed WooCommerce Google Analytics Integration.
After a week of installation, no sales transactions were showing in GA. (Only visitor non ecommerce data)

Yes I can confirm Paypal order confirmation redirection is setup correctly.