This often happens to me when opening the free WOF on my email on my PC especially on Chrome browser however it works fine on other browsers such as edge or firefox. This is an easy fix, just try to refresh it or open it on other browsers. Also, spinning on your phone might work as I never encountered that issue when opening WOF on my phone. The issue may be on the captcha itself on your browser which is why you can't spin on the WOF.
I also think for a while it's better to do another alternative that can be done, actually you don't need to use another browser but just use a private browser it seems it's working fine, maybe it's because the slow internet makes the captcha not load properly
This happened again with me today. I tried to spin the WoF spin on my laptop but the captcha kept on loading.
Then at the same time I opened it in my mobile and fortunately it worked and I was able to spin the WoF spin.
I wonder why it did not work the previous time since I had spin the WoF on mobile previously too.
Since the issue keeps insisting and you have experienced it a second time, I suggest you follow all the suggestions provided on this thread regarding your issue. Clearing the cache on your browser could fix it or probably try re-installing your browser and see if the issue still persists or even try to log-in using other browsers available on your laptop. You can also check lan cable to see if you have any internet issues.
At least, you've identified that the issue might probably on your laptop since it works fine on your phone.