Fix ecosystem switcher when using different accounts

[mahibi]

seems #5868 was merged too early, there are some scenarios where it fails

Scenario 1

• have account A (username: user1 on serverA) on files app
• have account B (username: user2 on serverB) on talk app
• in talk app, tap on files icon
• fails with message "Invalid account format. Must be an email"

Scenario 2

• user1 on serverA on files app
• user2 on serverA on talk app
• in talk app, tap on files icon -> switches to files a and shows warning "Account not found" which is expected in my opinion
• in files app, tap on talk icon -> switches to talk but shows no warning that account was not found

..... more scenarios to check .....

[mahibi]

@sowjanyakch could you fix this and try out more scenarios?