Importing SCF file worked, but APM login customization not there

Did you transfer and import the tar file with the SCF?

K13408: Overview of single configuration files (11.x - 14.x)

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Data not contained in the SCF 

The data files in the BIG-IP filestore in the /config/filestore directory (for example, the SSL certificate/key files and external monitor files) are not saved in the SCF . Files in filestore that are referenced by the SCF configuration are automatically saved into a separate TAR file when a copy of the SCF is saved.

By default, the name of the TAR file has the same name as the SCF file and have .tar as the file extension. For example, when you save an SCF using the name myscf1, the default created TAR file is named myscf1.tar, and both files saved in the /var/local/scf directory as follows:

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Are the relevant files in the filestore?

/config/filestore/files_d/Common_d/customization_group_d/:Common:apm_rha_z1v_citrix_resource_remote_desktop_customization_1038256_1

When the SCF file is imported, the various config elements are re-created on the target device.

As they are created in the new MCPD database, the element ID gets recreated. In the case of filestore objects, this changes the cache path and revision number. If you install the tar file with the SCF, these elements should be aligned.