Is it possible to see the keywords taped by the users that triggered the display of the Google Ads?

I need a link with a UTM to my website, which needs to go into another company’s regular newsletter.
(lets say the other company’s name is earthco)
Earthco’s newsletter is created every month, and is visible on their website, and is also emailed to clients.

Firstly we handle some conversions campaigns in facebook. The goal of those conversions campaigns is to count the numberss of users who create an account in our website.
Secondly we connect our website to google analytics 4 by using tags but the issue we have is we don’t see in google analytics 4 the same numbers of accounts created in facebook conversions campaigns and also some of the traffic is registered as referral.

The website which hosts the iframe is mysite.com. The iframe source is othersite.com. I have code/admin access to both websites.

I have weird problem (or maybe not).

I am exporting a report from Google analytics. The numbers for example for users
is shown as 10,907,302 in the report and when I do an export to a csv file it is shown
as “10,907,302”. I did not expect the commas to be exported as well. Yes, I know I can
do a query replace in the csv file but there are other columns there that contains strings
with comma in them. Is there a way to export the data without the comma delimter per 1000
for the numbers fields?

I am currently learning to be a data analyst. What is the most useful tool or practice you can recommend?