I am not sure, but, it is possible that people are not able to sign into the site with gmail because of a glitch in compatibility with WIX. I am on a computer, so anything I do may not apply to those who use phones, but it is worth a shot got those who can only lurk.
Firstly, make sure that you are using the latest version of these browsers that Wix supports: Google Chrome, Mozilla Firefox, Microsoft Edge, and Safari. It is recommended to use the latest version of these browsers to ensure optimal performance and security. If using google, sign into google first and then click on the SAV site and click log in with google in and see if that works. Once signed in, do a refresh and make sure that you can see your profile logo at the upper right. (I have to do this every time or I will not be able to view images; not sure about others)
If you still cannot log in, it is possible that you were caught up in the last May fiasco... and your mail/provider was deemed spam by the site. In that case you were likely blocked by WIX and sadly, there seems to be no support from WIX to contact unless you are a signed in owner of the site. It was a WIX AI error that Vaxman said was fixed... but...wasn't entirely.
I have not been well. I hope that being away for so long has not condemned the forums to be abandoned by the lurkers who view my posts. I am hoping to be able to do this at least until the election is over, but there may be more stretches like this as my overall health is deteriorating. I promise to try for as long as I can so be sure to peek in now and again. If you are a lurker and able to log in, consider writing here yourself now and again. (or just add a news blurb describing the story, with a source URL)