The URL you sign in with depends on which regional server your account is connected to.
Your geographic location doesn't always match the server your information is stored on. Some companies also have custom URLs set up through Custom Branding. If you have trouble signing in, reach out to your LSC admin or Account Manager.
Regional URLs
US Server: https://app.boostlingo.com/
CA Server: https://ca.boostlingo.com
UK Server: https://uk.boostlingo.com/
EU Server: https://eu.boostlingo.com/
AU Server: https://au.boostlingo.com/
Next steps / Getting more help
For all users: if none of these let you sign in, confirm your regional server and any custom URL with your LSC admin or Account Manager.