Requesting Temporary Access on iCloud.com through Advanced Data Protection Always Fails

Whenever I attempt to access data protected by Advanced Data Protection on iCloud.com, it sends a request to my phone, which I approve; the website says my device hasn't given access, and my iPhone says it succeeded. This feature hasn't worked for me since it launched, no matter which device I'm requesting from or approving with. Has anyone made this work?

Other than iCloud Private Relay, I'm not using any sort of VPN or non-standard networking. Aside from turning off data protection to access via the browser, it's unclear what else I could do to troubleshoot this.