Hi @Kesha Shah ,
Normally, it would be validating all what is inside fo the sequence container; including the connections used; database object definitions; etc. This may be affected if you are working off-line of if SSIS cannot get connection to those sources/objects.
As someone mentioned in the link you provided, he cannot connect to database after putting tasks in sequence container.
You may refer to see if it is helpful.
Regards,
Zoe
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