DAX Formula

From my customers table, I would like to check the Phone No. column and return output where any of the below is true:

1. Blanks
2. Phone No. digits are not 9
3. Phone No. with special characters

However, my formula below is not working, kindly assist with a better approach.

Invalid Phone No. Numbers =

VAR InvalidCharacters = “abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()”_+={}[]|\:;\'<>,.?/~`”

RETURN FILTER('Customers',

   OR(

       ISBLANK('Customers'[Phone No.]),

       LEN('Customers'[Phone No.]) <> 9,

       NOT(ISNUMBER(VALUE('Customers'[Phone No.]))),

       COUNTROWS(FILTER(UNICHAR(SEQUENCE(LEN('Customers'[Phone No.]),1,0)), FIND(UNICHAR(SEQUENCE(LEN(InvalidCharacters),1,1)), UNICHAR(SEQUENCE(LEN('Customers'[Phone No.]),1,0)))) > 0),

       COUNTROWS(FILTER(UNICHAR(SEQUENCE(LEN('Customers'[Phone No.]),1,0)), FIND(" ", UNICHAR(SEQUENCE(LEN('Customers'[Phone No.]),1,0)))) > 0),

       COUNTROWS(FILTER(InvalidLengths, LEN('Customers'[Phone No.]) = VALUE)) > 0

   )

)