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A variety of other issues and irregularities can cause imports to not succeed or partially succeed, including, but not limited to, a BioProject having multiple associated GSE IDs, incomplete information on the GEO or ENA page, and either the GEO or ENA project not being publicly available. 

FAQ

What are GEO and ENA? 

The Gene Expression Omnibus (GEO) and the European Nucleotide Archive (ENA) are web-accessible public repositories for genomic data and experiments. You can access and learn more about their resources at their websites:

GEO - https://www.ncbi.nlm.nih.gov/geo/

ENA - https://www.ebi.ac.uk/ena 

How do I know if a GEO project is also in ENA?

You can search ENA using the GEO ID (e.g., GSE71578) to check if there is a matching ENA project (Figure 5).