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Standby Database Creation Issue

I created standby database on same server on which primary exists. I am getting TNS issue for Standby TNS due to that FAL failed to request gap sequence.
In Primary log file
Fatal NI connect error 12520, connecting to:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=catovmcl01-ld8z0-scan.prodexacssubnet.catoprvcn.oraclevcn.com)(PORT=1528))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=PFLEXRPT.prodexacssubnet.catoprvcn.oraclevcn.com)(CID=(PROGRAM=oracle)(HOST=catovmcl01-ld8z01)(USER=oracle))))
Primary TNS
PFLEXCDB_PRI=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL= TCP)
(HOST= Scan_NAME)
(PORT= 1528))
(CONNECT_DATA=
(SERVER= DEDICATED)
(SERVICE_NAME= PFLEXCDB_PRI.prodexacssubnet.catoprvcn.oraclevcn.com)))
In Standby Log file
PR00 (PID:188039): FAL: Failed to request gap sequence
PR00 (PID:188039): GAP - thread 1 sequence 24-24
PR00 (PID:188039): DBID 2573059216 branch 1106383893
PR00 (PID:188039): FAL: All defined FAL servers have been attempted
Standby TNS
PFLEXRPT=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL= TCP)
(HOST= Scan_NAME)
(PORT= 1528))
(CONNECT_DATA=
(SERVER= DEDICATED)
(SERVICE_NAME= PFLEXRPT.prodexacssubnet.catoprvcn.oraclevcn.com)))
on Primary
log_archive_dest_3 string LOCATION=+RECOC1 VALID_FOR=(AL
L_LOGFILES,ALL_ROLES) DB_UNIQU
E_NAME=PFLEXCDB_PRI
log_archive_dest_4 string SERVICE=PFLEXRPT LGWR ASYNC VA
LID_FOR=(ONLINE_LOGFILES,PRIMA
RY_ROLE) DB_UNIQUE_NAME=PFLEXR
PT
On Standby
log_archive_dest_3 string LOCATION=+RECOC1 VALID_FOR=(AL
L_LOGFILES,ALL_ROLES) DB_UNIQU
E_NAME=PFLEXRPT
log_archive_dest_4 string SERVICE=PFLEXCDB_PRI LGWR ASYN
C VALID_FOR=(ONLINE_LOGFILES,P
RIMARY_ROLE) DB_UNIQUE_NAME=PF
LEXCDB_PRI
LOG_ARCHIVE_DEST_4
ORA-12520: TNS:listener could not find available handler for
requested type of server
This error I am getting in primary database for log_archive_dest_4
DB Name = PFLEXCDB
Primary Unique Name= PFLEXCDB_PRI
Standby Unique Name = PFLEXRPT