Solution to Web.whatsapp.com not working under Iron version Version 84.0.4300.0 (Official Build) (64-bit)
1. Go to chrome web store (more tools, extensions, click top left and open chrome webstore)
2. Search for "user agent switcher"and select the one made by google
See screenshot #1
20200929ua switcher by google.PNG
3. Install the extension and right-click it. Select options.
4. In the "custom user agent list" add a "new user agent name"
Use the following user-agent string:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36
and name it "Chrome 85"
See Screenshot #2
20200929add agent chrome85.PNG
5. Select the extension, first select "chrome", then "chrome 85"
See screenshot #3
20200929 select chrome85.PNG
6. Go back to the tab containing web.whatsapp.com and hit F5 (reload)
Proceed normally.
Hope this helps,
Cheers,
BlaBla