Google Chrome, and therefore every Chromium-based web browser, no longer support embedded credentials in URLs. As a result, credentials cannot be pushed directly into a basic authentication prompt anymore.
In Remote Desktop Manager, a typing macro can be set up to automatically input usernames and passwords:
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Select the entry to edit, then go to Properties - Connection - Events.
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In the After Open tab, set the initial wait time to 2 or 3 seconds, and enter in the typing macro box: $USERNAME${TAB}$PASSWORD$
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Go to Properties - Security - Security Settings, and make sure the Allow Password in Variable checkbox is checked.
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Using this method, usernames and passwords should be automatically typed on session launch.