identifier assignment fails during enrollment

These identifier assignment are defined:

[ RECORD 1 ]------+-------------------
id | 3
co_id | 3
status | A
context | CP
identifier_type | messnumber
email_type |
description | MESS Number
login | f
algorithm | S
format | (#)
minimum | 1000
maximum |
permitted | AN
collision_resolution |
exclusions |
ordr |
created | 2020-06-21 18:15:26
modified | 2020-06-21 18:15:26

[ RECORD 2 ]------+-------------------
id | 4
co_id | 3
status | A
context | CP
identifier_type | messid
email_type |
description | MESS ID
login | f
algorithm | S
format | MESS(I/messnumber)
minimum |
maximum |
permitted | AN
collision_resolution |
exclusions |
ordr |
created | 2020-06-21 18:16:25
modified | 2020-06-21 18:16:25

These extended types are defined:

-[ RECORD 97 ]-----+-------------------------
id | 146
co_id | 3
attribute | Identifier.type
name | messid
display_name | MESS ID
edupersonaffiliation |
status | A

[ RECORD 98 ]-----+------------------------
id | 145
co_id | 3
attribute | Identifier.type
name | messnumber
display_name | MESS Number
edupersonaffiliation |
status | A

Going through a self-service enrollment the enrollee ends up in the Approved (not Active) status and the identifiers have not been assigned/created.