CHASE Bank is blocking Safari 15 browsers

This is insane!

Not insane; just incompetence.

This is clearly Chase Bank's problem to fix. They need to stop using the outdated and privacy-intrusive "user agent" query as the means to determine if a browser can handle their website, which was never a good idea to begin with. Unfortunately, that leaves you out in the cold until they realize the error of their ways and correct it.

The workaround for end users who are unable to update their Macs to a newer macOS version is to use a different browser.

Consider Brave:

https://brave.com/

Firefox is a distant second choice:

https://www.mozilla.org/en-US/firefox/new/

The bottom line is that there is nothing wrong with your Mac's version of Safari, but that bank is using an outdated and ill-conceived method of determining browser requirements. If you are so motivated direct their attention to the WWW publication User-Agent Client Hints (courtesy VikingOSX).

In-depth background discussion here: chase wants me to update safari to 16, should I do that? - Apple Community

robertgavila wrote:

CHASE Bank is blocking Safari 15 (15.6.1 on my iMac) browsers from logging into their bank accounts. There was no announcement that they were going to do this.

This is insane!

sound like you need to let Chase support know.

If you can't upgrade your Mac beyond Catalina, and Chase won't that version of Safari, you'll need to find another browser. I think that Firefox and Brave have versions that work with Catalina (not 100% sure).

I can no longer log into Advantis Credit Union or Chase bank. I get error messages on both. I just tried the apps. Advantis app worked but no luck with the Chase app. What's up??? I am on an ipad with the latest system updates.

If you can’t upgrade your Mac to macOS Big Sur, which uses Safari 16, your only avenue is to use another browser as stated in the previous replies. I can confirm that the last version of Firefox is compatible with macOS Catalina 10.15 and, more importantly, with the Chase website.

You can download it here: https://www.mozilla.org/en-US/firefox/new/.

I just signed in on Safari, but using 17.0.3.