Copy URL button in AWS Workspaces Directory SAML Test prompt copies the string "URL"

When you try to test a SAML configuration for AWS Workspaces Directory you are given a prompt that has the test URL in it with the appropriate relayState and URL settings. The prompt advises you to copy the URL. There is a copy button on the left side of the URL string. When you click this button in Safari (untested with other browsers) it copies the string "URL" instead of the actual contents of the URL.