Since upgrading CAS apps are sporadically requiring users to login twice in 
a row.  One of the app error log snippets includes the following.  We are 
unable to reproduce the issue at will and hoping that someone recognizes 
this and can provide info.  TIA - Michael

2021-Aug-16 05:08:19 ERROR org.opensaml.SAMLObject - caught an exception 
while parsing a stream: cvc-datatype-valid.1.2.1: 
'1cd276bb-3545-4f46-b1ee-629e66453b85' is not a valid value for 'NCName'. 
2021-Aug-16 05:08:19 DEBUG 
org.springframework.security.cas.web.CasAuthenticationFilter - 
Authentication request failed: 
org.springframework.security.authentication.BadCredentialsException: 
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 243; 
cvc-datatype-valid.1.2.1: '1cd276bb-3545-4f46-b1ee-629e66453b85' is not a 
valid value for 'NCName'. 
org.springframework.security.authentication.BadCredentialsException: 
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 243; 
cvc-datatype-valid.1.2.1: '1cd276bb-3545-4f46-b1ee-629e66453b85' is not a 
valid value for 'NCName'.

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