Element doesn't let users bind their emails with identity servers if the m.3pid_changes capability is off

[sandhose]

Steps to reproduce

1. Use a server which advertises the m.3pid_changes capability to false, like beta.matrix.org
2. Somehow have an email address associated with the account
3. Try to share that email with an identity server

Outcome

What did you expect?

Be able to share the email

What happened instead?

The button is greyed out

---

The faulty logic is probably here:

element-web/src/components/views/settings/discovery/DiscoverySettings.tsx

Lines 91 to 94 in 23613ac

	const capabilities = await client.getCapabilities();
	setCanMake3pidChanges(
	!capabilities["m.3pid_changes"] || capabilities["m.3pid_changes"].enabled === true,
	);

Operating system

macOS

Application version

Element Nightly version: 2024103101 Crypto version: Rust SDK 0.7.2 (517d99b), Vodozemac 0.7.0

How did you install the app?

No response

Homeserver

Synapse 1.117.0 with MAS 0.12.0

Will you send logs?

No